Popping or rumbling from a water heater usually means sediment buildup on the tank bottom, very common with Arizona's hard water. Flushing the tank can help, but heavy buildup shortens tank life. If the unit is 8 to 12+ years old, replacement ($900 to $3,000) may be the better value.
Likely causes
| Cause | What's happening |
|---|---|
| Sediment buildup | Hard-water minerals settle and overheat at the bottom. |
| Scale on the heating element | Common in electric units with hard water. |
| Aging tank | Older tanks are more prone to noise and failure. |
- Active leaking from the tank
- Water pooling around the base
If anyone is in danger, or you smell gas, leave the home and call 911 or your utility immediately.
Frequently asked questions
What causes water heater making a popping noise?+
Several issues can produce this symptom, from simple maintenance items to component failure. The likely causes table on this page lists what each cause looks like so you can describe the problem accurately when you request quotes.
Should I call someone right away?+
Call promptly if you see active water, no cooling during Arizona summer heat, burning smells, or repeated breaker trips. Otherwise, gather details and compare two written quotes before approving repairs.
Can PlumbAirAZ diagnose the problem?+
PlumbAirAZ is an Arizona plumbing and HVAC pricing and referral marketplace, not a contractor. We publish local price ranges and route your quote request to independent licensed service providers who contact you directly.
Related pages
Page Summary
- Topic
- Water Heater Making a Popping Noise
- Location
- Arizona
- Best for
- Homeowners diagnosing the issue
- Primary action
- Request a professional diagnosis
- Related services
- See related pages
- Last reviewed
- June 2026
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Last reviewed: June 2026
PlumbAirAZ.com is a pricing, education, and referral marketplace. We do not perform the work unless expressly stated. Your request may be shared with or sold to independent HVAC, plumbing, or home service providers that may contact you about your project.